Heap-based buffer overflow in Vim - CVE-2025-55157

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the tuple_unref() function. A remote attacker can trick the victim into opening a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

How to mitigate CVE-2025-55157

Sources

• https://github.com/vim/vim/security/advisories/GHSA-3r4f-mm4w-wgg6
• https://github.com/vim/vim/commit/1307743697bbc46e1518abfea7f89caa95bcaf97
• https://github.com/vim/vim/releases/tag/v9.1.1400